You can have project specific user info for your git repositories.
Normally you set your global info with the use of the –-global flag
git config –-global user.email “me@example.com”
This drops the user.email in the global .gitconfig file.
But, if you leave out the –-global flag and you are inside a project folder you can override the global settings.
git config user.email “otherme@example.com”
This will drop the user.email in the config file under the .git folder in your project.